Hi, I have the same situation where Im interested in returning a subset of results from the whole set, such as results 500 to 550. However, I have already implemented a Filter that will return the results I want without additional query processing needed (i.e. no need to use the IndexSearcher.search(Query, Filter) method). Im just wrapping a ConstantScoreQuery around the filter, and passing it into the IndexSearcher.search(Query) method to return a Hits object. Then Im asking for the 500th to 550th doc in the Hits object.
Would such a case still cause Hits to rexecute over and over again on higher numbered results? Or is this different because Im using a ConstantScoreQuery, so it just uses the BitSet from the filter to determine the results more quickly instead of executing a Query? Would I still be better off using TopDocs returned from IndexSearcher.search(Weight, Filter, nDocs) to get the results? Since TopDocs only returns the doc ids and I need field information, is the common method to use the IndexReader.document(id) to fetch field information from each doc id returned by TopDocs? Thanks!! Gary -----Original Message----- From: Chris Hostetter [mailto:[EMAIL PROTECTED] Sent: Thursday, May 25, 2006 11:22 AM To: java-user@lucene.apache.org Subject: Re: best way to get specific results : if a query returns 1000 results, the user is interested only in the : results between 500&550. the way I implemented it is run a normal query : using IndexSercher.search(Query()) and then get the specified documents : out of the hits object. I am wondering if there is a more efficient way : than this, is using TopDocs better than the hits object, knowing that : some users may need more than a 1000 docs back in one query?. generally speaking, yes TopDocs (or TopFieldDocs) are better then Hits if you plan on acessing morethen the first 100 or so results .. Hits will reexecute your search over and over as you ask for higher numbered results, while with TopDocs you search is executed once, and you are given only the Doc IDs of the first N docs you asked for, with no other processing done behind the scenes (in your case, it sounds like N would be 550, and you'd start accessing the ScoreDoc[] at 500. -Hoss --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
